﻿#region License
/* ---------------------------------------------------------------- *
 *
 * This file is part of the Xcoordination Application Space
 * ("XcoAppSpace") http://www.xcoordination.com
 *
 * Copyright (C) 2009 Xcoordination http://www.xcoordination.com
 *
 * XcoAppSpace is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General
 * Public License as published by the Free Software Foundation.
 *
 * XcoAppSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/
 * or write to the Free Software Foundation, Inc., 51 Franklin
 * Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ---------------------------------------------------------------- */
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace XcoAppSpaces.Security.Basic
{
	/// <summary>
	/// Utility class for encrypting passwords and comparing two encrypted passwords.
	/// </summary>
	public static class PasswordUtil
	{
		/// <summary>
		/// Creates a hash for the given password string using SHA512 algorithm.
		/// </summary>
		/// <param name="password">The password string to hash.</param>
		/// <returns>The hash value.</returns>
		public static byte[] CreatePasswordHash(string password)
		{
			if (string.IsNullOrEmpty(password))
				return null;
			SHA1Managed hasher = new SHA1Managed();
			byte[] hashed = hasher.ComputeHash(Encoding.UTF8.GetBytes(password));
			hasher.Clear();
			return hashed;
		}

		/// <summary>
		/// Compares two hashes, returns true if they are equal.
		/// </summary>
		/// <param name="pw1">First hash.</param>
		/// <param name="pw2">Second hash.</param>
		/// <returns>true if the hashes are equal.</returns>
		public static bool AreEqual(byte[] pw1, byte[] pw2)
		{
			if (pw1.Length != pw2.Length)
				return false;
			for (int i = 0; i < pw1.Length; i++)
			{
				if (pw1[i] != pw2[i])
					return false;
			}
			return true;
		}
	}
}
